code: def meta_data(self):
      if self._meta_data is None:
          with open(self.split_filename_meta_data, "r") as f:
              self._meta_data = json.load(f)
      return self._meta_data
  
imports: import numpy
  import os
  import json
  import h5py
  from tqdm import tqdm
  from torchmeta.utils.data import Dataset, ClassDataset, CombinationMetaDataset
  from torchmeta.datasets.utils import get_asset
label_desc: Use image node_id 6 for calling the BachClassDataset obj's underlying member method code with example usage: obj.meta_data() and returns: self